"""Used by the make system to generate info_config.h from info.json.
"""
from pathlib import Path

from dotty_dict import dotty
from milc import cli

from qmk.decorators import automagic_keyboard, automagic_keymap
from qmk.info import _json_load, info_json
from qmk.path import is_keyboard, normpath


def direct_pins(direct_pins):
    """Return the config.h lines that set the direct pins.
    """
    rows = []

    for row in direct_pins:
        cols = ','.join(map(str, [col or 'NO_PIN' for col in row]))
        rows.append('{' + cols + '}')

    col_count = len(direct_pins[0])
    row_count = len(direct_pins)

    return """
#ifndef MATRIX_COLS
#   define MATRIX_COLS %s
#endif // MATRIX_COLS

#ifndef MATRIX_ROWS
#   define MATRIX_ROWS %s
#endif // MATRIX_ROWS

#ifndef DIRECT_PINS
#   define DIRECT_PINS {%s}
#endif // DIRECT_PINS
""" % (col_count, row_count, ','.join(rows))


def pin_array(define, pins):
    """Return the config.h lines that set a pin array.
    """
    pin_num = len(pins)
    pin_array = ', '.join(map(str, [pin or 'NO_PIN' for pin in pins]))

    return f"""
#ifndef {define}S
#   define {define}S {pin_num}
#endif // {define}S

#ifndef {define}_PINS
#   define {define}_PINS {{ {pin_array} }}
#endif // {define}_PINS
"""


def matrix_pins(matrix_pins):
    """Add the matrix config to the config.h.
    """
    pins = []

    if 'direct' in matrix_pins:
        pins.append(direct_pins(matrix_pins['direct']))

    if 'cols' in matrix_pins:
        pins.append(pin_array('MATRIX_COL', matrix_pins['cols']))

    if 'rows' in matrix_pins:
        pins.append(pin_array('MATRIX_ROW', matrix_pins['rows']))

    return '\n'.join(pins)


@cli.argument('-o', '--output', arg_only=True, type=normpath, help='File to write to')
@cli.argument('-q', '--quiet', arg_only=True, action='store_true', help="Quiet mode, only output error messages")
@cli.argument('-kb', '--keyboard', help='Keyboard to generate config.h for.')
@cli.subcommand('Used by the make system to generate info_config.h from info.json', hidden=True)
@automagic_keyboard
@automagic_keymap
def generate_config_h(cli):
    """Generates the info_config.h file.
    """
    # Determine our keyboard(s)
    if not cli.config.generate_config_h.keyboard:
        cli.log.error('Missing parameter: --keyboard')
        cli.subcommands['info'].print_help()
        return False

    if not is_keyboard(cli.config.generate_config_h.keyboard):
        cli.log.error('Invalid keyboard: "%s"', cli.config.generate_config_h.keyboard)
        return False

    # Build the info_config.h file.
    kb_info_json = dotty(info_json(cli.config.generate_config_h.keyboard))
    info_config_map = _json_load(Path('data/mappings/info_config.json'))

    config_h_lines = ['/* This file was generated by `qmk generate-config-h`. Do not edit or copy.' ' */', '', '#pragma once']

    # Iterate through the info_config map to generate basic things
    for config_key, info_dict in info_config_map.items():
        info_key = info_dict['info_key']
        key_type = info_dict.get('value_type', 'str')
        to_config = info_dict.get('to_config', True)

        if not to_config:
            continue

        try:
            config_value = kb_info_json[info_key]
        except KeyError:
            continue

        if key_type.startswith('array'):
            config_h_lines.append('')
            config_h_lines.append(f'#ifndef {config_key}')
            config_h_lines.append(f'#   define {config_key} {{ {", ".join(map(str, config_value))} }}')
            config_h_lines.append(f'#endif // {config_key}')
        elif key_type == 'bool':
            if config_value:
                config_h_lines.append('')
                config_h_lines.append(f'#ifndef {config_key}')
                config_h_lines.append(f'#   define {config_key}')
                config_h_lines.append(f'#endif // {config_key}')
        elif key_type == 'mapping':
            for key, value in config_value.items():
                config_h_lines.append('')
                config_h_lines.append(f'#ifndef {key}')
                config_h_lines.append(f'#   define {key} {value}')
                config_h_lines.append(f'#endif // {key}')
        else:
            config_h_lines.append('')
            config_h_lines.append(f'#ifndef {config_key}')
            config_h_lines.append(f'#   define {config_key} {config_value}')
            config_h_lines.append(f'#endif // {config_key}')

    if 'matrix_pins' in kb_info_json:
        config_h_lines.append(matrix_pins(kb_info_json['matrix_pins']))

    # Show the results
    config_h = '\n'.join(config_h_lines)

    if cli.args.output:
        cli.args.output.parent.mkdir(parents=True, exist_ok=True)
        if cli.args.output.exists():
            cli.args.output.replace(cli.args.output.parent / (cli.args.output.name + '.bak'))
        cli.args.output.write_text(config_h)

        if not cli.args.quiet:
            cli.log.info('Wrote info_config.h to %s.', cli.args.output)

    else:
        print(config_h)
